Find the molecular mass (in kilogram) of ammonia molecule NH₃.

To find the molecular mass of ammonia (NH₃), we need to consider the atomic masses of its constituent elements: nitrogen (N) and hydrogen (H).

Atomic Masses

• Nitrogen (N): approximately 14.01 g/mol
• Hydrogen (H): approximately 1.01 g/mol

Calculating Molecular Mass

Ammonia consists of one nitrogen atom and three hydrogen atoms. The molecular mass can be calculated as follows:

Molecular Mass of NH₃ = (1 × Atomic Mass of N) + (3 × Atomic Mass of H)

Molecular Mass of NH₃ = (1 × 14.01 g/mol) + (3 × 1.01 g/mol)

Molecular Mass of NH₃ = 14.01 g/mol + 3.03 g/mol = 17.04 g/mol

Converting to Kilograms

To convert grams to kilograms, divide by 1000:

Molecular Mass in kg = 17.04 g/mol ÷ 1000 = 0.01704 kg/mol

Final Result

The molecular mass of ammonia (NH₃) is approximately 0.01704 kg/mol.